""""一个可用于表示汽车的类"""
class Car():

    def __init__(self,make,model,year):

        self.make=make
        self.model=model
        self.year=year
        self.odometer_reading=0

    def get_descriptive_name(self):

        long_name=str(self.year)+' '+self.make+' '+self.model
        return long_name.title()
    
    def read_odomenter(self):
        print("This car has "+str(self.odometer_reading)+" miles on it.")

    def update_odometer(self,mileage):
        if mileage>=self.odometer_reading:
            self.odometer_reading=mileage
        else:
            print("You can't roll back an odometer!")
    
    def increment_odomenter(self,miles):
        self.odometer_reading+=miles